Water-cooled amplifier



Oct. 31, 1944.

A. MARzoLl ET AL 2,361,487 wATER-cooLED AMPLIFIER Filed June 2l, 1941 a? lNvENoRs a r 'f '1 Mar o KQZZL' 5 g/LU'WV ATTORNEY.

Patented Oct., 31, 19.44

s parar crric i 2,361,481 WATER-Coenen 4.iii/minimis Application June`21, 1941, Serial No. 399,066' In Italy October 29, 1940 6 Claims.

This invention relates to'an amplifier arrange ment comprising one or more electron tubes cooled by water circulation and final tuning condenser for radio transmitters. Y

In radio transmitter equipment, especially power transmitters, the tube or tubes of the end or power amplifier stage are cooled by the aid of circulating water, a cooling jacket being provided for each such tube in which the plate of the tube is mounted in such a way that,l with the water being caused to circulate, the outer surface of the plate is brought in contact with the refrigerant. In cases where the amplier comprises several tubes, the cooling jacket is united preferably in a single unit for each pair of such tubes.

The present invention has as its object an assembly and arrangement of the kind above indicated in which the spaces adapted to contain the plates of each tube consist of chambers in a common tube support and cooling block or header (that is, consisting of a single part) from which extend directly outward fins or ribs forming the ixed plates or stator parts of the condenser which cooperates with the tubes, the whole being preferably combined in a single fused cast piece.

In the appended drawing is illustrated by way of example an embodiment of the arrangement of this invention.

Fig. 1 is a side elevation partly in section.

Fig. 2 is a partial plan view.

In the form of construction as here shown.

` i denotes a head in which, opposite each tube 2 is formed a chamber or space 3, there being disposed in the latter the anode or plate 2 of the tube in such a way that there results a space or gap t. Tube 2 is fixed in position in chamber s by the aid of a collar 8 fitted or formed on the mouth `of the chamber and a ring 8 which is screwed upon the collar 5 and engages with the small collar orgdisk 2" of the tube, with interposition oi an elastic washer 1.

In the wall or the shell of chamber 3 is formed a conduit 8 which, by way of the Joint 9 as well as pipe I0 and union I5 is connected with the insulating cooling pipe coil II, while the other end of this coil is united by means of tube I2 with joint I3 attached to the base of chamber 3 opposite its opening I4.

The head I is provided with parallel fins I6 which extend transversely thereto. These fins IE form the stator plates of the power or finalstage tuning condenser of the transmitter.

The rotor of the condenser consists of ns or plates I1 disposed between the ns I8 and supported by the cross shaft I8 which is driven in any convenient manner and is journaled at the ends in ball bearings 20 which are supported. in turn, by small bridge pieces or strips 2l which are united by means of clips 22 to the lateral longitudinal cross pieces 23 of insulation material, the latter, in turn, being attached to the head I by means of parts 24.

The assembly comprising the two heads of the type as hereinbefore described mechanically united by means of insulating cross rods 23 and the ns I6 'are symmetrical in respect to the axis of the shaft I8 of the condenser and are supported by means' of the insulators I9 which insure their being properly electrically insulated because the'assembly is subject to the action ofhigh potential applied to the anodes or plates of the tubes 2. For the same electrical reason, the coil II is made of insulation material such as porcelain, for instance.

The form of construction as hereinbefore outlined s simple and inexpensive contrasted with the designs heretofore known in the art because the assembly is built up of castings and the space required therefor is reduced for the reason that the stator plates I6 of the condenser v are directly attached to the head I in which.

are formed two chambers 3 for the mounting of the tubes2. The assembly may therefore be mounted at a greater distance from the panels and metallic parts of the radio transmitter, and therefore the residual (stray) capacities are diminished, this being particularly advantageous where short Waves are being worked with. For

this reason, it is also possible to operate the transmitter at higher frequencies compared with what is feasible with the arrangements known in the prior art.

In the exempliiied embodiment here shown,

the fins I1 of the rotor comprising parts Hand shaft I8 oi the condenser are constructed in a way so as to co-operate to the same measure and in the same sense with the opposite iixed or stator plates or fins I6 which extend towards the interior of the two end heads of the assembly,

they being symmetrical with reference to the shaft I8. However, if desired, the disposition and the shaping of the xed or stator fins or plates I6 and of the rotor plates II could be chosen other than here suggested and shown.

What is claimed is: 1. A variable electric transmitting condenser comprising a group of parallel spaced rotor plates mounted for rotation on a shaft, two groups of parallel arranged spaced stator plates each having a metallic block portion located at an end'of said plates and integral therewith, said block portions having their lengths located at right angles with said stator plates and each having an aperture therein, said shaft located intermediate said stator plates, means for retaining an electron discharge device within each aperture in said blocks, and means for supplying cooling fluid to the aperture in said blocks to cool the electron discharge device.

2. A variable electric transmitting condenser particularly adapted for short wave use, comprising a group of parallel spaced rotor plates mounted for rotation on a shaft, two groups of parallel arranged spaced stator plates each having a metallic block portion located at an end of said plates and integral therewith, said block portions having their lengths located at right angles with said stator plates and each having block portions having their lengths located at right angles with said stator plates and each having an aperture therein, said shaft located intermediate said stator plates, ,means for retaining an electron discharge device within. each aperture in said blocks, means for supplying cooling fluid to the aperture in said blocks to cooithe electron discharge device, and insulating bearing means for supporting said shaft and fastened to each one of said blocks.

4. High frequency apparatus including a plurality of fluid cooled electron discharge tubes having at least an anode electrode, a variable condenser having movable plates mounted on a shaft, two metallic cooling blocks, each block having recessed portions for the anode of each one oi said tubes for permitting fluid cooling t0 circulate around the anode, a plurality of ilns forming the iixed plates of said condenser and arranged integral with said metallic blocks, a pair of lateral insulating support members secured to each one of said blocks, the .movable plates of said condenser being located in a central position between said blocks and interleaved with said fins, and a bearing means for said shaft located in each one of said lateral insulating supports.

5. High frequency apparatus comprising an amplifier including a plurality of uid cooled electron discharge tubes having at least an an- 0de electrode, a variable condenser having movable plates mounted on a shaft, a pair of metal. lic cooling blocks, each block having a pair of recessed portions for the anode of each one of said tubes for permitting fluid cooling to circulate around the anode, a collar around each anode for securing the tubes to said blocks, a.y plurality of fins forming the` xed plates of said condenser and arranged integral with vsaid metallic blocks, the movable plates of said condenser being located-in a central position between said blocks and interleaved with said ns, and bear` ing means for said shaft insulatingly supported from each block.

- 6. A radio transmitter comprising an amplifier including a plurality of iiuid cooled electron discharge tubes having at least an anode electrode,

a variable condenser 4having movable plates mounted'on a shalt, two metallic cooling blocks, each block having recessed portions for the anode of each one of said tubes for permitting iluid cooling to circulate around the anode, a collar around each anode for securing the tubes to said blocks, an elastic washer interposed between said collar and said blocks, a plurality of ilns forming the fixed plates of said condenser and arranged integral with said metallic blocks, the movable plates of said condenser being located in a centrai position between said blocks and interleaved with said ilns, and bearing means for said shaft insulatingly supported from each block.

MARzoLL FERNANDO caavaun'rr. 

